Urban Models 25 Years on

Marr's vision: 25 years on

A review at the time of publication predicted that "Even if no single one of Marr's detailed hypotheses ultimately survives...[his] lifework will have been vindicated when neuroscientists cannot understand how it was ever possible to doubt the validity of his theoretical maxims." 25 years on, most would agree that Marr's recipe for investigating human vision and, in particular, his strategy of ...

Bulimia nervosa: 25 years on.

25 years of regular publishing

25 years of regular publishing Iranian Journal of Physics Research has been publishing since 1996. We are giving a short report on this experience and the progress of IJPR.

Sales-Force Decision Models: Insights from 25 Years of Implementation

Over 25 years, we have developed many sales-force and mod-eling insights through over 2,000 projects with several hundred selling organizations in over 50 countries. Content insights are useful in making sales-force decisions. Examples are that profitability is flat for a wide range of sales-force sizes; phased sales-force growth is rarely optimal; focused strategies dominate scattered strategi...

Orbital angular momentum 25 years on [Invited].

Twenty-five years ago Allen, Beijersbergen, Spreeuw, and Woerdman published their seminal paper establishing that light beams with helical phase-fronts carried an orbital angular momentum. Previously orbital angular momentum had been associated only with high-order atomic/molecular transitions and hence considered to be a rare occurrence. The realization that every photon in a laser beam could ...